Walter s



(No Model.) W. S. JENNINGS.

SPRING SASH BALANCE.

No. 400,918. Patented Apr. 9, 1889.

WITN'ESSES: IIVVENITOI? A TTOR/VEY N4 PETERS. Phokamhoraplwr. Wahlmon.C.

UNITED STATES ATENT OFFICE.

WALTER S. JENNINGS, OF ROCHESTER, NEWV YORK, ASSIGNOR, BY MESNEASSIGNMENTS, TO ADELBERT CRONISE, OF SAME PLACE.

SPRING SASH BALANCE.

SPECIFICATION forming part of Letters Patent No. 400,918, dated April 9,1889.

Application filed September 4, 1888. Serial No. 284,542. (No model.)

To all whom it may concern.-

Be it known that I, WALTER S. JENNINGS, a citizen of the United States,and a resident of Rochester, in the county of Monroe, State of New York,have invented certain new and useful Improvements in Spring SashBalances, of which the following is a specification.

My invention relates to improvements in that class of window-sashbalances in which the sash is supported at each side by the metal ribbonattached thereto, and passes over and around a revolving spring, uponwhich it is wound, and the weight of the sash supported by the action ofa coiled spring within the drum, the drum being held at rest with thesash in any desired position by the action of the brake.

In the spring sash-balances heretofore in use the retarding andrestraining pressure of the brake has been applied either upon the outercoil of the ribbon wound upon the drum, or upon the narrow edges of thesurface of the periphery of the drum on each side of the ribbon woundthereon, or upon the beveled portions of the sides of the drum at itsperiphery. In the process of construction and in practical useobjections are found to each of the brakes thus applied and to theparticular forms of spring by which they are actuated.

The objects of my invention are to provide a brake and a spring foractuating the same which shall be of simple construction, easy ofadjustment, and reliable and uniform in their operation. I attain theseobjects by the mechanism illustrated in the accompanying drawings, inwhich Figure 1 is a longitudinal vertical section of the whole device;and Fig. 2, a cross-section of the drum, brake, and spring, similarletters referring to similar parts.

F is the frame which sustains all the parts in their proper relations.

D is a spring-drum fitted in the ordinary manner to be revolved in onedirection by the coiled spring 0 within, one end of the spring beingattached to the drum at or near its periphery, the other end being fixedto the stationary axis A, upon which the drum revolves, the ends of theaxis being held by the frame F.

R is a ribbon, of metal or other suitable material, for sustaining thesash, one end of the ribbon being attached to the edge of the sash andthe other attached to the periphery of the drum in such a manner thatwhen revolved by the coiled spring within it the ribbon will be woundupon the drum and exert a lifting action upon the sash.

S S are two pieces of spring metal provided with the buffers b b, whichpress toward each other against the opposite sides of the interposeddrum.

8 is a set-screw, provided with the nut N, bearing" upon the lower arms,a a, of the springs S S. In adjustment the set-screw s is turned, andthe arms a a of the springs S S are caused to be pressed down by the nutN until the buffers 12 b are thereby pressed against the opposite sidesof the drum with sufficient force to produce the desired restrainingaction upon the rotation of the drum' that is, until the weight of thesash, plus the restraining action of the brake, balances the rotatingforce of the spring-drum.

Having fully described my invention,what I desire to claim and secure byLetters Patent In a spring sash-balance, the adjustable 0pposing brakesS S, fitted to press toward each other against the opposite sides of theinterposed drum, substantially as shown and described.

WALTER S. JENNINGS.

Witnesses:

GEo. FORCE PARKER, ADELBERT CRONIsE.

